Three cues for determining transitive and the intransitive verbs in Japanese.
1. If the verb ends with ARU, the verb is an intransitive verb. It becomes the transitive verb when changing ARU to ERU.
ex) 変わる→変える、止まる→止める
2. If the verbs are ended with RERU it is an intransitive verb
ex) 流れる、破れる、割れる、生まれる
3. If the verb are ends with SU it is a transitive verb.
ex) 返す、帰す、出す、直す、残す